YARN-45. Add protocol for schedulers to request containers back from
ApplicationMasters. Contributed by Carlo Curino and Chris Douglas.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1479771 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk-gd
Merge remote branch 'origin/trunk-gd' into fb-HADOOP-7435-trunk-gd